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+--- Thread: Ubuntu 16.04 cannot resolve dns - connection timed out; no servers could be reached (/showthread.php?tid=4019)
Ubuntu 16.04 cannot resolve dns - connection timed out; no servers could be reached - marcosti - 03-01-2017
Hi,
I'm running Ubuntu 16.04 (Linux pine64 3.10.104-2-pine64-longsleep) for a few days on my Pine64 2GB. What I notice is that after a reboot DNS works fine, but after sometime DNS is no longer able to resolve.
When DNS fails I get a message like:
nslookup www.google.com
;; connection timed out; no servers could be reached
However, if I reboot the Pine64 DNS works like a charm.
I've got a fixed IP defined in /etc/network/interfaces.d/eth0
auto eth0
#iface eth0 inet dhcp
iface eth0 inet static
address 192.168.1.158
netmask 255.255.255.0
gateway 192.168.1.1
dns-nameservers 8.8.8.8
Which works because ifconfig shows the following:
eth0 Link encap:Ethernet HWaddr 4a:7c:01:2a:0d:57
inet addr:192.168.1.158 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::487c:1ff:fe2a:d57/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:172911 errors:0 dropped:9 overruns:0 frame:0
TX packets:84150 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:28673200 (28.6 MB) TX bytes:26435938 (26.4 MB)
Interrupt:114
ip route shows the following:
default via 192.168.1.1 dev eth0 onlink
192.168.1.0/24 dev eth0 proto kernel scope link src 192.168.1.158
Does anybody have a suggestion where I should look for the rootcause/solution?
RE: Ubuntu 16.04 cannot resolve dns - connection timed out; no servers could be reached - MarkHaysHarris777 - 03-01-2017
(03-01-2017, 02:16 PM)marcosti Wrote: Hi,
I'm running Ubuntu 16.04 (Linux pine64 3.10.104-2-pine64-longsleep) for a few days on my Pine64 2GB. What I notice is that after a reboot DNS works fine, but after sometime DNS is no longer able to resolve.
When DNS fails I get a message like:
nslookup www.google.com
;; connection timed out; no servers could be reached
However, if I reboot the Pine64 DNS works like a charm.
I've got a fixed IP defined in /etc/network/interfaces.d/eth0
auto eth0
#iface eth0 inet dhcp
iface eth0 inet static
address 192.168.1.158
netmask 255.255.255.0
gateway 192.168.1.1
dns-nameservers 8.8.8.8
Which works because ifconfig shows the following:
eth0 Link encap:Ethernet HWaddr 4a:7c:01:2a:0d:57
inet addr:192.168.1.158 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::487c:1ff:fe2a:d57/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:172911 errors:0 dropped:9 overruns:0 frame:0
TX packets:84150 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:28673200 (28.6 MB) TX bytes:26435938 (26.4 MB)
Interrupt:114
ip route shows the following:
default via 192.168.1.1 dev eth0 onlink
192.168.1.0/24 dev eth0 proto kernel scope link src 192.168.1.158
Does anybody have a suggestion where I should look for the rootcause/solution?
hi, try adding an automated ping to the nameserver ( temporarily ) to see if it helps.
Setup a crontab entry to run a script containing something like the following:
ping -c 3 <nameserveraddress>
( or similar., its a counted ping to the nameserver ip address )
Have the crontab entry ping the server every thirty minutes or an hour and see if that helps. If so, you need to find out why things are going to sleep. It would not hurt at all to maintain the ping in crontab forever.
RE: Ubuntu 16.04 cannot resolve dns - connection timed out; no servers could be reached - dkryder - 03-01-2017
google probably dumps people in some kind of load shift scheme. do you list a secondary?